Camera.



PATENTED MAR. 22, 1904. H. ODONNELL & W. G. SOUTH.

GAMERA. APPLICATION FILED SEPT. as, 1903.

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No. T55 235.

UNITED STATES Patented March 22, 1904.

PATENT OEEIcE.

HUGH ODONNELL, OF PITTSBURG, AND VILLIAM O. SOUTH, OF

BERXVYN, PENNSYLVANIA.

CAMERA.

SPECIFICATION forming part of Letters Patent No. 755,235, dated lviarch22, 1904.

Application filed $eptember 28, 1903. Serial No. 174,909. (No model.)

To all w/wm it may concern.-

Be it known that we, HUGH ODONNELL, residing at Pittsburg, county ofAllegheny, WILLIAM C. SOUTH, residing at Berwyn, and county of Chester,State of Pennsylvania, have jointly invented certain Improvements inCameras, of which the following is a specification.

This invention relates to cameras having means for producingsimultaneously a plurality of negatives of the same object. Its chiefpurpose is to provide a polygraph-camera adapted for simultaneouslyproducing by a single lens three images of the same object ofsubstantially the same intensity and at substantially equal distancesfrom the optical center of the lens without the use of the costly andnotreadily adjustable prisms with reducers and focal-distance regulatorsheretofore required.

A further object is to provide a simple, inexpensive, compact, andreadily-adjustable camera of the character described adapted for the useof color-screens and films, by which negatives suitable for use incolor-photography may be obtained.

An additional object is to regulate the admission and controlthedispersion of the lightrays, to avoid light interferences, to preventblurring of the images, and to save waste of film.

The nature and characteristic features of the improvements will morefully appear by reference to the following.description and theaccompanying drawings in illustration thereof, of which- Figure 1represents a horizontal sectional view of a camera embodying theinvention. Fig. 2 represents a similar view of a modified form ofconstruction made in accordance with the improvements. Fig. 3 representsa sectional View of details, showing further variations of construction.Fig. .L is a diagrammatic representation of the action of the lightrays,and Figs. 5, 5 5 6, 6, 6 7, 7, and 7" represent stops which may beemployed in the improvements.

Referring to the drawings, the camera-box comprises the back walls 1, 2,and 3, the doors at and 5, and the front wall 6. It contains thepartitions 7 and 8, which form the chambers 9 and 10 for holding thefilm-rolls 11 and 12, the film 13 being drawn over rollers 14.,-

15, 16, and 17 at the angles of the back walls. The interior, bound bythe back walls, front wall, and film-chamber partitions, is providedwith the lens-tube 18, containing the lenses 19, and is divided intothree chambers 20, 21, and 22 by the non-actinic partitions 23 and 24,which converge from the angles between the back walls toward thelens-tube and carry mirrors 25 and 26, arranged to divide the lightpassing the lens, the mirrors reflecting the lateral rays and throwingthem upon the sensitized surfaces or sections of film held at rightangles thereto in the rear of the lateral coinpartments 21 and 22, whilethe central rays impinge directly on the sensitized surface orfilm-section held at right angles thereto in the rear of the centralcompartment 20. It has been found that mirrors suitable for this purposemay be produced by grinding or etching and blackening to rendernon-actinic the back of a glass plate. The more usual forms of mirrorshave been found unsatisfactory, as they produce double images, fogs, andblurs. Mirrors of polished glass of non actinic colorsuch as black, red,and orange may be employed, (without etching or frosting,) as alsopolished metal, hard rubber, and like substances susceptible oftakingahighly-polished reflecting-surface. To prevent light passingthrough the lens from striking directly on the film in the lateralchambers, thereby destroying the reflected image, the outside rays arecut off by an apertured plate or slide 27, held by the guides 28 againstthe front board 6 and having its sides 29 and 30 overlapping the outerparts of the lens. The front board may have the flange 6 projecting intothe bore of the tube, so as to overlap the periphery of the lens 19', orsuch periphery may be blackened to cut off the outside rays. Thelight-apertures in the plate 27 may contain the color-screens 31, 32,and 33, held across the entrance to the several chambers. The

light may also be filtered by color-screens 3 1, 35, and 36, movablyseated in the partitions of the respective chambers adjacent to thesensitized surfaces or film sections therein. In some cases it may bedesirable to use the two sets of filters or screens simultaneously inthe positions describedas, for instance, with pale filters in outdoorwork and bright light, while with indoor work and subdued light but oneset may be used. This arrangement of filters by which either one or moremay be used in each compartment permits the regulation of the exposureof each of the several film sections or the sensitized plates, which maybe substituted therefor. To further control the light-rays, there areemployed stops having apertures designed to suit various conditions. Insimultaneously exposing three sensitized surfaces or film-sections withfilters adjusted so that the time exposures for the several colors(violet, green, and red orange) would be the same, the stops 10, 41, and42, having the respective regular oblong apertures 10, 4:1, and 42,would serve for the various light conditions; but with filters havingdifferent exposure ratios in order to regulate the light passing throughthe respective filters to correspond with the exposure ratios there maybe employed the stops 4:3, (with aperture-sections 4:3 4:3 43,) 44:,(with aperture-sections 14' 14 44) and 15, (with aperture-sections 4:54:5 15') or stops 46, (with aperture-sections 46 46 16) 17, (withaperture-sections 17 a7 17%) and 18, (with aperture-sections 18 a8 48.)It will be understood that these irregular rectangular apertures havethe areas of their several sections related in the ratios of thelight-filters employed and are of the several sizes required for varyinglight conditions. It will be seen that this construction provides forthe admission of light rays, as 51 and 52, which pass through the lens,so as to impinge upon the mirrors 25 and 26 and be thrown thereby uponthe sensitized surfaces in the rear of the lateral compartments at rightangles to the paths of such reflected rays, while direct rays, as 53 and54, are cut off therefrom. The rays, as 55, passing into the centralcompartment, impinge directly and form a direct image on the sensitizedsurface extending across their path in the rear of said compartment.

The expression frosted as used in the claims is to be understood as asurface that has been ground, etched, sandblasted, or otherwise treatedfor producing the peculiar condition which'avoids the reflection of adouble image or a haze interfering with a single image.

Having described our invention, we claim- 1. In a camera, in combinationwith a lens, a plurality of non-actinic reflectors dividing the lightpassing through said lens, and mechanism for holding a sensitizedsurface across the path of the light reflected from each of saidreflectors, substantially as specified.

2. A camera having a plurality of chambers, a lens communicating withsaid chambers, mirrors oblique to and dividing the light passing throughsaid lens, and mechanism for holding a sensitized surface in therespective chambers in the paths of the reflected and direct lightfromsaid lens,substantially as specified.

3. A camera havinga plurality of chambers, a lens com municati ng withsaid chambers, an d a non-actinie reflector dividing the light passingthrough said lens, substantially as specified.

4:. In a camera, a lens, in combination with a mirror comprising a glassplate having a frosted, non actinie back, substantially as specified.

5. In a camera, a lens, in combination with a mirror comprising a glassplate having its back ground and blackened, substantially as specified.

6. In a camera, a compartment, a plurality of partitions dividing saidcompartment into separate chambers, a lens-tube communicating with saidchambers, mirrors in said partitions receiving rays of light passingthrough said tube, and screens in the path of said light-rays,substantially as specified.

7. In a camera, a lens, in combination with a mirror, mechanism adaptedfor passing a film across the path of the direct and reflected rays fromsaid lens, and means for simultaneously exposing sections of said filmto direct and reflected rays from said lens, substantially as specified.

8. In a camera, a lens or lenses, in combination with a compartmentdivided into a plurality of chambers arranged to receive light from saidlens or lenses, mechanism for holding sections of a film in the rear ofsaid compartment, and mirrors for reflecting light ontering lateralchambers of said compartment, substantially as specified.

9. In a camera, a lens, a mirror disposed to divide the light passingthrough said lens, and means for preventing interference with saidmirrored rays by direct rays passing through said lens, substantially asspecified.

10. In a camera, a lens, a mirror disposed to divide light passingthrough said. lens, in combination with an apertured stop havinglight-sections of varied size, and light-filters to whose ratios thesizes of said sections are adjusted, substantially as specified.

11. In acamera, a lens, in combination with a chamber disposed toreceive light from said lens, a mirror disposed to reflect said light, ascreen disposed between said lens and mirror, and means for cutting offthe direct rays passed by said lens and disposed to interfere with saidreflected rays, substantially as specified.

12. In a camera, a lens, in combination with IIO a chamber disposed toreceive light from said lens, a mirror disposed to reflect said light,and a slide disposed between said lens and mirror for cutting off raysdisposed to interfere with rays reflected by said mirror, substantiallyas specified.

13. In a camera, a lens, in combination with mirrors disposed in thepath of light passing from said lens; a slide for cutting oifinterfering rays, mechanism for holding a sensitized surface disposed toreceive light reflected by said mirrors, and color-screens disposedbetween said lens and mirrors, substantially as specified.

In testimony whereof we have hereunto set I5 our hands, this 23d day ofSeptember, A. D. 1903, in the presence of the subscribing witnesses.

HUGH ODONNELL. WVM. 0. SOUTH.

Witnesses;

E. 0. SOUTH,

WV. L. HOLDING.

